Keep getting this error when I run a program UC_OBJECTS_NOT_CONVERTIBLE

Question

I created a project via CMOD for a modification to a BW extractor.  It is pretty simple coding but when I try and execute the extractor via RSA3 I get the following error.  I've attached the code as well and it is something with line 17.  can you please help
Short text
    Data objects in Unicode programs cannot be converted.
What happened?
    Error in the ABAP Application Program
    The current ABAP program "SAPLXRSA" had to be terminated because
    come across a statement that unfortunately cannot be executed.
Error analysis
    The statement
       "MOVE src TO dst"
    requires that the operands "dst" and "src" are convertible.
    Since this statement is in a Unicode program, the special conver
    rules for Unicode programs apply.
    In this case, these rules were violated.
Trigger Location of Runtime Error
    Program                                 SAPLXRSA
    Include                                 ZXRSAU01
    Row                                     17
    Module type                             (FUNCTION)
    Module Name                             EXIT_SAPLRSAP_001
Source Code Extract
Line  SourceCde
    1 *&----
    2 *&  Include           ZXRSAU01
    3 *&----
    4
    5 TABLES: VTTK.
    6 DATA: L_MCCOMVTTS LIKE MCCOMVTTS,
    7       L_TABIX LIKE SY-TABIX.
    8
    9
   10
   11 CASE I_DATASOURCE.
   12
   13  WHEN '2LIS_08TRTLP'.
   14
   15 *FIND TDLNR & VSART IN THE SHIPMENT HEADER TABLE
   16
>>>>>  LOOP AT C_T_DATA INTO L_MCCOMVTTS.
   18   L_TABIX = SY-tabix.
   19   SELECT SINGLE * FROM VTTK WHERE TKNUM = L_MCCOMVTTS-TKNUM.
   20
   21 *FILL FIELDS WITH DATA FROM VTTK(SHIPMENT HEADER TABLE)
   22   IF SY-SUBRC = 0.
   23    L_MCCOMVTTS-Z_TDLNR = VTTK-TDLNR.
   24    L_MCCOMVTTS-Z_VSART = VTTK-VSART.
   25    MODIFY C_T_DATA FROM L_MCCOMVTTS INDEX L_TABIX.
   26   ENDIF.
   27  ENDLOOP.
   28 ENDCASE.

Answer 1

ra you sure the
table C_T_DATA and the work area L_MCCOMVTTS have the smae fileds with same data element .
i think somewhere ther is adifference that why systerm is umable to populate the table data in to work area..
<b>i have observed that C_T_DATA is not defined any format..
Make sure u have the same structure for the work area as well</b>
Please Close this thread.. when u r problem ise solved
Reward if Helpful
Regards
Naresh Reddy K
Message was edited by:
        Naresh Reddy